You have a french OS, all in french, you download SQL Server in French, you start the setup and you face this error :
This SQL Server setup media does not support the language of the OS, or does not have the SQL Server English-language version installation files. Use the matching language-specific SQL Server media; or install both the language specific MUI and change the format and system locales through the regional settings in the control panel.
Don’t panic, you check all your regional settings, your in French (Canada)…. Why it’s not working….. I don’t know, but change all your regional settings to French (France). Start the setup, install and enjoy.
Put back your regional setting back to french canada after the setup.